Federal regulators are targeting 64,400 pounds of lead, which has been linked to developmental and reproductive problems, and 79,200 pounds of arsenic, a known carcinogen. The EPA also wants to cut down on mercury discharges by 2,820 pounds and aluminum by 1.97 million pounds. Reducing these pollutants is expected to help 23,600 miles of waterways.

EPA claims the new rules will affect only 134 of 1,080 power plants in the U.S., which will have to invest in new equipment to comply with the new rule.

“The EPA estimates that compliance costs for the rule will total around $480 million each year, while monetary benefits will total anywhere from $415 to $566 million,” according to ClimateProgress.